A good battery can fully charge your smartphone several times and your laptop at least once. If you travel a lot, it’ll save you a lot of faff. Buy the latest [Wirecutter recommendation](https://thewirecutter.com/reviews/best-usb-c-battery-packs-and-power-banks/). <!-- #web/useful --> <!-- {BearID:BF1C04D2-31E2-407A-85CD-1F313D3BC7A9-89894-0004D194F5C43C6E} -->